Fandom is what we call the participatory community of fans, in which they interact with one another in sfclubs; via correspondence, fanzines and online fora; and at sf conventions. Science fiction led to fandom's creation and continues to be its major focus, yet a liking for the genre does not of itself make you part of fandom. You cannot be a fan alone or even among others who also like sf — you must have contact with the microcosm.

Sociologically, fandom consists of fans who are in contact with others, indulging in fanac and maintaining interest in the community. It is a subset of the whole sf community; it overlaps but does not encompass prodom and does not include the vast majority of consumers of science fiction.

Anyone can join fandom, but like most communities, fandom expects newcomers to learn our language, traditions, customs and mores. Fandom is a gift economy and meritocracy that appreciates desire to belong, effort to participate and the ability to express one's self — either in writing or verbally. Communicating with other fen is an essential part of fandom. Joining fandom requires climbing the Mountains of Inertia. and moving purposefully past the Circle of Lassitude, not always easy tasks.

As Roger Ebert put it in a 2004 article in Asimov's, "Fandom grew out of and fed a world-view that was dubious of received opinion, sarcastic, anarchic, geeky before that was fashionable….a world that stood outside the mainstream. Science fiction was the occasion for fandom, and often the topic, but the subterranean subject was a kind of kibitzing outsider world view.''

In the 1960s and '70s, the movement spread like an epidemic. Subfandoms began splitting off, as devotees and promoters of comics, Star Trek, mystery fiction, sex or other subjects began to form separate institutions focused on those topics, sometimes with profit-making motivations; further "adjective fandoms" spun off from those, and as the term fandom proliferated in mundane use, groups such as "baseball fandom" and "Hello Kitty fandom," with no connection to sf fandom have arisen. There has been much controversy over whether Trufandom encompasses all these disparate groups or not.

The word fandom antedates science-fiction fandom (and for that matter, science fiction). According to the Oxford English Dictionary, it appeared in print in a sports context as early as 1896. Its present usage is for SF fandom and various pop-culture groups which have appropriated the term and sometimes some of the other aspects of fandom.
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The world in which fans live and move and have their being. (With an ordinal number attached it refers usually to Speer's system of fan history, treated under Numerical Fandoms.) Sociologically it is the class of all fans who are in contact with others, indulging in fanac or simply being aware of the existence of fans all over the world. Physically it might be imagined as comprising all the science fiction houses, and all fans' dens as well as other storage space and equipment that they use in fan activity, and convention halls and streets and eke park benches while groups of fans are in possession of them. Unincorporated territories include the possessions of mere scientifictionists.

Fandom got its start in New York City around 1930 when people who had been writing to the prozines began writing to each other. In following years SF clubs were formed and monthly bulletins issued. The movement spread like an epidemic. In the 30s there were perhaps one or two hundred fans at a given time; by 1948, maybe a thousand; today there may be as many as five thousand in all parts of the world, about 2000 of these in America. (It has been suggested by Harry Warner that the size of active fandom is naturally limited by the availability of its objective; namely, egoboo.)

Aside from the fandom in the United States, Anglofandom began at the same time and at times has surpassed the Amerifans in activeness. Canadian fandom as an entity became important about 1940; it hosted the first Worldcon outside the US (TorCon, 1948). By 1952 it had recovered from this experience, pretty nearly. Because of interest and friendship linkages beyond that of language, all three of these — and probably the small but active Anzac fandoms — can be considered, usually, as one unit. But fans outside the English-speaking bloc have increased tremendously in numbers since World War II, also.

From time to time, people will stand up and ask what is the purpose of fandom. The Michelistic reply was that fandom should associate itself with political movements for a scientific/socialistic world state; other semi-Michelistic replies are along similar lines in that some sort of political interest is enjoined. Speer maintains that fandom, as fandom, should influence the world only thru its influence on individual fans, who may be influential men some day. Some have believed that stimulation of science is our chief justification; others, that stimulation of fiction is our purpose — i.e., that fans should function as connoisseurs of science fiction [persons with trained and cultivated tastes in the field] in trying to raise its literary standards. And there are those who hold the pleasure derived from fanac its own justification.

The world in which fans move and have their being. Physically, it mite be imagined as comprising all the science fiction houses, and all fans' dens as well as other storage space and equipment that they use in fan activity, and convention halls and streets and eke park benches while groups of fen are in possession of them. Unincorporated territories include the possessions of mere scientifictionists.

Fandom began around 1930, when correspondence between fans had reached some proportions, and a few clubs came into existence. In the following years fan magazine took form and gathered audiences. About 1935, fandom became an independent organism, and has passed thru the stage of First Fandom, First Transition, Second Fandom, Second Transition, and Third Fandom, as Speer so quaintly calls them. There are now about 500 people associated with fandom in some small way, of whom a hundred mite be called real fans; the disappearance of a selected twenty of them would probably mean the end of fandom as now known.

From time to time, people will stand up and ask what is the purpose of fandom. The Michelistic reply is that fandom should join the Leftist movement and work for a scientific-socialist world state. Other semi-Michelistic replies are along similar lines. Speer maintains that fandom as fandom should influence the world only thru its influence on the individual fans, who may be influential men some day. Some have believed that stimulation of science is our chief justification. Probably the majority believe that the pleasure derived from fan activity is justification enuf.